Introduction -- Voluntary environmental programs -- An overview of performance track -- Methodology -- Assessment of performance track's concept and design phases -- Assessment of performance track's implementation phase -- Cooperation with other state and EPA programs -- The role of voluntary and regulatory programs in accelerating environmental improvements -- Findings, conclusions, and lessons learned for moving forward with voluntary programs at EPA -- Appendix A: Semistructured interview questions -- Appendix B: Discussion guide for focus groups with performance track members -- Appendix C: Discussion guide for focus group with EPA regional coordinators.